Vehicle jack



AT r3 E11:

W. TASTENHOYE VEHICLE JACK Filed Dac. 4. 1923 mi f ' motor-cars have been one of the jacks, an

Patented Oct'. 13, 1925.

UNITED STATES WYNANT TASTENHYE, 0F BENIN, BELGIIH.

vnHIcLE Tacx.

Application tiled December 4, 1923. ySerial Nb. 878,487.

To all whom t may concern.'

Be it known that I, WYNANT TASTEN- HOYE, a citizen of the Kingdom of Belgium, residing at 12 Rue dYpres, in Menin, Kingdom of Belgium, have invented certain new and useful Improvements in Vehicle Jacks;

vand I do hereby declare the following to be a full, clear, and exact description of. the invention, such'as will enable others skllled in the art to which. it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to liquid-pressure hoisting-attachments to motor-cars and other vehicles, the object in view being to produce a simple and efficient device by which the pressure produced by aumpplunger is distributed to one of severa jacks` fastened to the vehicle and the hoisting-piston of which is controlled by a s ecial coilspring which, being stretched uring the downwards stroke of the jack-piston, tends to draw said iston back into its cylinder and to force t e pressure-liquid back into the reservoir through the same distributing and return device.

In fact, a number of liquid-pressure hoisting devices fixed to the underframe of proposed heretofore, but they all presented the twofold inconvenient that, first, .the distribution of pressure liquid from the ump to any desired d) the return and recuperation of said liquid after release of the pressure, required a complicated and expensive construction of valves or cocks,

the operation and control of which were also intricate; secondly, that the springv necessary for returning the jack-piston did take a comparatively large room within the jack cylinder, thus reducing the stroke of the piston, unless telescoping systems were resorted to, which however did only ensure a sufficient strength when considerably increasing the weight of the jack.

This present invention avoids both defects, on one part by connecting each of the jacks by a Cep'arate conduit-pipe, with one and the same liquid-pressure distribution and return cock of special construction, directly connected and fastened to the compresison chamber of the pump and, on the other part, by using for returning the jackpiston, a tension coil-spring'fastened with its lower end at the foot of the jack-piston and with its upper end in the uper part of the jack-cylinder within which it is guided and located in a separate annular chamber formed by a double wall of said cylinder.

By this arrangement, one and the same cock-key controls, according to the position it is rotated to, either the pressure or the release inor from any one of the jacks, as require'd, and moreover, the ycomplete length of the jackiston can be used for hoistlng the car, whi st the complete return of the piston into the cylinderof the jack, forcing the liquid back into the reservoir, takes place under the tensile strength of the spring when the cock-key has been rotated to the position coresponding to pressurerelease. Other systems have been known for obtaining the same results but they all require the handling of several or separately with the uid reservoir. The resent invention uses only one special coc which, by the operation of only one cock-plug producing4 either the communication between the ump and every one of the jacks individually or the communication between every jack individually and the fluid reservoir.

My invention comprises various details of construction, combinations and arrangements of parts which will be hereinafter fully describe'd, and shown in the accompanying, drawings and then specifically defined in the appended claims.

In the drawings in which the invention is illustrated in a four-jacks application to a motor-car,

Fi s. l and 2 are general views of the comp ete arrangement, Fig. 1 being a side elevation and Fig. 2 a rear elevation.

Fig. 3 is-an axial vertical section of one bf the jacks when closed, i. e. in inoperative position.

Fig. 4 is a vertical section on line V-U Fig. 1, showing the reservoir containing the liquid, the pressure-pump and the special distribution and return-valve or cock.

Fig. 5 is a corresponding section taken on as well known of any well knownconstructlon such as tween the highest point proved preferably having a horizontal plunger such as B1, driven by a lever such as L for compressing the liquid from reservoir A into the pressure-chamber B2 upon which is directly fastened and connected the imdistribution and return device C, that opens or closes as desired, the communication with any one of the pipes D, each of which communicates with one of the pressure-jacks E.

The distribution and return-device C is a sort of multi-way-cock. The shell C1 of said cock presents four ways and nozzles C2-C2-C2-C2-, each of which is connected to an exterior pipe D leading to one of the jacks E. Said four ways (l2-C2 are bored in oneand the same horizontal level and open internally in the front half of the shell, leaving between each other sufficient width of solid metal for making a tight lit against the opening of a passage C4 bored radially in the plug C3 and having the same cross-section as the ways C2, in such a manner that said opening C4r can be alternately closed by the solid wall of the shell or brought into communication with one of the ways (I2-C2, according to the position to which said plug has been rotated.

Said passage C4L is vertically protracted downwards in the axis of rotation of the plug and communicates directly and permanently, with the pressure-chamber B2 of pump v Same cock-shell C1 is moreover provided, at a horizontal level lower than the level of the ways C2-C2, with an annular groove that communicates with a canal C6 and a return conduit to the reservoir A.. On its side diametrically opposed to the peripheral opening kor' passage C, the plug C3 is provided with a vertical groove C8, the width of which is somewhat larger than the diameter of the ways C2C2 whilst its length is somewhat greater than the distance beof ways C2 and the lower sidecf groove C5.

Owing to this construction, a part-rotation of plug C3, brings passage C4 in alignment with one of the ways C2, and since the direct communication with the pressurechamber B2 of pump B, is always` free at its lower end, it opens at its upper end the connection with the pipe D and jack E corresponding to said way C2. After a suficient pressure inthe desired jack E having been obtained by the action of the pump-plunger B1, the opening of passa-ge 4 is brought, by rotating the plug C3, either in front of a solid pa'rt of the shell, or in front of another way C2, the pressure being maintained in the operated jack. When the passage C4l has 'been brought inv aligny when piston ment with another way C2, pressure may be applied in the above manner, to the jack corresponding. with same. When, however, the rotation of plug C3 is continued until the Vertical groove C8 comes in alignment with the way G2 corresponding to the laden jack, same opens the communication between said way C2, annular groove C5, hole C6 and return conduit C7, thus allowing the liquid in the laden jack E tobe forced back into reservoir A, under the returnstroke of the jack-piston E1.

, But this return stroke of the jack-piston El, although being produced in. itsl part by the mere weight of the car, so long same bears upon the jack, would not continue when the four wheels rest on the ground and said piston has no more load to bear. It is thus necessary for the continuation of said stroke to be produced by a spring, returning the jack-piston E1 into the jack-body with a sulicient excess of strength for forcing the liquid 'back On the other hand, it is necessary that said spring be arranged so as to find its housing within the jack-cylinder, without interfering neither with the length of the piston-stroke, which latter must be sufcient for hoisting the car at the required level, regardless of the possible unevenness of the soil, nor with the tightness of the jack-piston.

In accordance to the present invention, these results are obtained in forming the jack-body of a double-wall cylinder such as E2, the head' Ei of which is connected through a bored conduit with the corresponding pressure pipe D. In the annular chamber between the double-wall is fitted the coil-spring Esffastened at its upper end by two screws E4 passing through the outerwall of the jack-body and between the spring-coils. In the cylindrical ,chamber formed by the internal wall, fits tightly a jack-piston E1 provided at its upper en with a leather or other suitable packing such as E8 and at its lower end with a tread-shoe E2. Immediately above said shoe E?, the piston is formed with an annular shoulder Ee'of suitable height and width for allowing two coils of Ithe spring E3 to be screwed on same, the mere retraction or contraction of the spring ensuring a strong grip which tightens more and more E1 is forced down by the liquidpressure and stretches out spring E3. In order to avoid said pressure forcing the jack piston E1 completely out of cylinder E2, the internal wall of same may be. provided at the critical point of the downward stroke, with an upwardly turned hole E", through which the pressure liquid will low out into the annular housing for spring E3; this will cause an instantaneous release of the resistance in the pump and warn the operator to iirst to the reservoir.

c'easehislpumping. This small quantity of When the pressure is`relieved by operat- I ing the distribution and return cock as above described, the 'ack-piston will rise, and the car descend, first under the double effect of the car-weight and ofthe spring tension, and later under the influence of spring Ea alone, until said spring Es and the piston E1 have completed reintegrated their respective housing within the jack-cylinder E2. It will be readily observed that inversely to what occurs in any other system known heretofore, thehousing of sprin E3 being separated from the housing of Jack-piston E1, said jack-piston is free to work with its whole length, which cannot be the case when using sprmgs that are compressed within the jack-cylinder during the downward stroke of the piston for returning same later by their expansion. Moreover it is not necessary to resort to telescoping arspending to the num r of rangrements which are always complicated, wea exposed. to leakage, and heavy.

Anotherv advantage of this jack arrangement is that the double-wall of the cylinder are reinforced by the coils of the spring and can thus be made comparatively thin without danger of deformation or undue stress at the points where they are pressed in the clips H, fastening the 'acks to the axles or other parts of the un erframe.

It will be seen that the return conduit C7, protracting downwards in the reservoir, is continued upwards to the top of the shell C1 where it is obturated by a screw plug such as E for allowing to refill thereservoir A, when necessary; an air-hole in said plug excludes any excess of pressure in reservoir A that would hinder the readmittance of li uid in same. l

oreover, the plug-key E is shaped to form an index-paw] registering with the position-marks on the upper part of the cock-shell.

Althou h the illustrated form of execution has een wshown and described as embodied in an arrangement with four jacks, same could of course apply to an attachment with any other number of jacks, every jack being of the specified construction and the num er of ways in the cock-shell and of pressure distributin -pipes alliways correac s.

It should be understood t t the arrangement and construction of pump and pipes, the method of securing the pump, pipes and jacks on the car, and their respective osition are not included within theI scope o -the present patent, which is intended to coverl only the features specified in the appended claims.

What I claim as new is:

`1. Lifting devices for a vehicle comprising a pluralit of fluid pressure jacks applicable. to t e vehicle, a fluid pressure Pump the jacks and the fluid pump, a distributing device between the pump and said connections for delivering fluid to thejacks alternately, and means in said distributingdevice forreturning the fluid from the Jacks to the reservoir.

2.' Lifting devices according to claim l, in which the fluid distributing device comprises a shell having one or more ports for conveying liquid to conduits connected to the jacks, and a single port leading to the fluid containing reservoir, said distributing device compnising a plug having 'a port which, by rotation of the plug, can be brought alternately into coincidence with each and all of the distributing ports, and said plug having also a. groove which, upon further rotation of the plug can be brou ht alternately into coincidence with Ysaid istributing ports-to convey liquid from the jacks back to the reservoir through the aforesaid single port.;

3. Fluid-hoisting attachments for vehicles including a fluid pressure jackv comprising, a head having a fluid passage there- 1n, a cylinder havin double concentrically spaced walls extendin from said head, ay p1ston in said cylinder having a plunger and lifting member on its outer end, and a sprin cylin er connected at its innermost end with the cylinder and at its other end with the plston plunger so as to normally maintain u the piston 1n its innermost positlon.

4. A fluid pressure jack comprising a piston and plunger member havmg a lifting member on its outer end, a cylinder for said gisten having at one end a head having a uid passage therein and adjacent to its other end an aperture for limiting the extreme movement of the piston therein and providing a passage way for the fluid whereby the fluid may be emitted as a lubricant on the outside of the cylinder, a spaced concentric wall surrounding said cylinder, and a yspring within said s ace surrounding the cylinder and connecte at its ends with the jack members.

In testimony that I claim theforegoing as my invention, I have signed my name.

WYNANT TAsTENHoYEl and a reserivor, connections between.

between the spaced walls of the` 

